Please Help - Nested Movie Clips

Im working on a uni project and have his a brick wall

The project is a prototype PDA made up of a host movie (host.swf) which loads other swf’s in to display on the screen.

My problem is with my menu.swf

For example i include some code

//clock section starts
createEmptyMovieClip("clock_container",1);
container._x = 225;
container._y = 100;
clock_menu_btn.onPress = function() {
    loadMovie("clock.swf", "clock_container");
    _root.music_container._visible=false
    _root.shopping_container._visible=false
};
//clock section ends

I want the button when clicked to hide any other open movie clips.
It works fine when opened as menu.swf but if its nested in host.swf it doesn’t work.

Any ideas?

Thanks